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Two rectangular sheets of sizes 2pi xx 4...

Two rectangular sheets of sizes `2pi xx 4pi` and `pi xx 5pi` are available. A hollow right circular cylinder can be formed by joining a pair of parallel sides of any sheet. What is the maximum possible volume of the circular cylinder that can be formed this way?

A

`4pi^(2)`

B

`8 pi^(2)`

C

`1.25 pi^(2)`

D

`6.25 pi^(2)`

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